NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 35 



Halosydna macro cephala Essenberg (1917, pp. 53-55, pi. 3, figs. 

 22-33) was separated from H. calif ornica Johnson on differences in 

 shape and size of the prostomium and the greater depth of the grooves 

 of the palpi. These characters have questionable specific value. The 

 elytra were described as lacking marginal fringe. In H. johnsoni there 

 is a fringe, though often weak. In other respects the descriptions of these 

 two agree reasonably well. 



Halosydna reticulata Monro (1928a, p. 563) from the Galapagos 

 Islands may represent more than one species, perhaps none of which is 

 the same as H. johnsoni. The specimens investigated showed significant 

 differences in the tuberculation of the elytra and the nature of the 

 neuropodial setae. 



Distribution. — Southern California. Intertidal to 290 fms. (Moore, 

 1910, p. 331). Common in Crepidula colonies, in Anaheim Slough, 

 California. 



Halosydna glabra, new species 



Plate 4, Figs. 43-50 



Collections.— AAA-Z1, 683-37, 688-37 (Holotype). 7 specimens. 



Length of 25 segments about 24 mm, width with setae to 9 mm. 

 Nephridial papillae from seventh segment, but not large before the 

 tenth segment, from which they are conspicuous, pendulous, the distal 

 end slightly widened, diffusely rust or sooty pigmented. Elytral margin 

 entire, without fringe or papillae. 



The prostomium is about as broad as long. The 4 eyes are black, 

 the anterior pair slightly the larger, disposed at the sides of the widest 

 part of the prostomium; posterior eyes are near the postectal margin of 

 the prostomium. A shallow median sulcus divides the prostomial lobes. 

 Prostomial antennae are dark, the median ceratophore thicker than the 

 laterals and extending a little beyond them. The median style is about as 

 large and long as the peristomial cirri and resembles them in general 

 appearance. Lateral antennae are only about half as long as the median 

 antenna. Palpi are dark, smooth save for transverse wrinkles of contrac- 

 tion ; there are a pale subterminal enlargement and a terminal filament. 

 They extend distally beyond the longest peristomial cirri. One indi- 

 vidual (683-37) has palpi that are much longer, but they lack the con- 

 traction wrinkles. 



